Mold for concrete structures



Feb. 5 1924. 31,482,565 I c. E. JOHNSON ET AL MOLD FOR CONCRETE STRUCTURES Filed May 14, 1923 Patented Feb. 5, i924.

UNM'ED ST CHARLES E. JOHNSON AND WILLIAM W. FIELDS, F CLEVELAND, OHIO.

MOLD FOR CONCRETE STRUCTURES.

Application filed May 14,

T 0 all whom it may concern:

Be it known that we, CHARLES E. JOHN- SON and WILLIAM W. FIELDS, citizens of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio,

have invented certain new and useful Improvements in Molds for Concrete Structures, of which the following is a specification.

This invention relates to molds for concrete structures, and has for its object to provide an improved sleeve or device for making openings in concrete floors or walls at the time they are built. These openings are usually made for the purpose of permitting pipes to be run through concrete work without the necessity for cutting holes through the Work, the openings being produced by means of a sleeve around which the concrete is molded, the sleeve remain ing in place for the purpose referred to.

The invention is illustrated in the accompanying drawings in which Fig. 1 is a vertical section of the sleeve. Fig. 2 is a similar view showing the same set in the concrete. Fig. 3 is plan of the sleeve. Fig. e is a section on the line l4; of Fig. 3.

In the molding of concrete floors or the like, the concrete is laid in a form supported by false work, and in the use of the present device the sleeve is set in place in the form in the position where the desired opening is to be made.

In the embodiment shown, the sleeve consists of a sheet metal cylinder 6 around which the concrete is placed. This cylinder is open at both ends, and at the bottom it is slit and spread to form feet 8 which rest on the bottom 9 of the form, and some of the feet may have holes. 10 to receive nails to fix the sleeve in place. The sleeve may be strengthened by one or more corrugations 11 extendin around the same.

Near t e top, the sleeve has a corrugation 1923. Serial No. 638,324.

12, pressed inwardly, to supporta cap or plate 13 which fits within the sleeve and closes the top thereof so as to exclude concrete from the interior of the sleeve. The plate is snapped or pressed in under indentations or bosses 14 formed in the top edge of the sleeve.

In use, the sleeve will be set in place as stated and the cap 13 put in positlon. The concrete is then poured around the sleeve. Then the plate or cap 13 is knocked out or removed, leaving the sleeve open for the passage of the steam or water pipes or the like. This will save considerable time and labor heretofore required to cut holes through the concrete.

One of the principal objects 01" the plate or cap 13 is to eliminate the necessity for filling the sleeve 6 with sand or the like to prevent the concrete from entering the sleeve while it is being poured, a practice which has heretofore been common, and which involves considerable time and labor.

Vi e claimf 1. A device for the purpose stated. com-' prising a sheet metal sleeve provided with slits forming tongues bent out to form supporting feet at the bottom and a removable cap plate at the top.

2. A device of the kind described comprising a sleeve having a corrugation near its upper end, and a removable plate fitting within the sleeve and resting upon said corrugation, the top edge of the sleeve having indentations above the corrugation to hold the plate in place.

In testimony whereof, we afiix our signatures in presence of two witnesses.

CHARLES E. JOHNSON.

WILLIAM W, FIELDS.

Witnesses:

JOHN A. BOMMHARDT, BESSIE F. POLLAK. 

